Ok, I have a '92 SE stock. The heat works, just it has a loud almost roaring sound when its on and everytime i turn the **** to a different vent, i.e. vent to defrost, it makes an akward hissing sound. I can feel the heat, but very barely even when on full blast. I have a slight idea as to what i should do, just I dont know where to start or what to buy to replace what ever it is i am looking for. Please help